<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style type="text/css">
		#intro{
			font-weight:bold;
			color: red;
		}
	</style>
</head>
<body>

	<p id="intro">This is a paragraph of introduction.</p>

	<p >This is a paragraph of introduction.</p>
</body>
</html>